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  2. Trapdoor - Wikipedia

    en.wikipedia.org/wiki/Trapdoor

    A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [3]

  3. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    A door. A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a doorway or portal. A door's essential and primary purpose is to provide security by controlling access to the doorway (portal).

  4. Mantrap (access control) - Wikipedia

    en.wikipedia.org/wiki/Mantrap_(access_control)

    Entrance to HM Prison Edinburgh. A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.

  5. Garage (residential) - Wikipedia

    en.wikipedia.org/wiki/Garage_(residential)

    The most common doors on these garages were either two wooden barn style doors with a standard sized access door on the side of the garage or the B&D Rolla Door, which is described below. The most common garage door to date in Australia is the B&D Rolla Door, having been around since 1956 and still in heavy use today.

  6. Door security - Wikipedia

    en.wikipedia.org/wiki/Door_security

    A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions.

  7. Low-floor tram - Wikipedia

    en.wikipedia.org/wiki/Low-floor_tram

    A low-floor tram is a tram that has no steps between one or more entrances and part or all of the passenger cabin. The low-floor design improves the accessibility of the tram for the public, and also may provide larger windows and more airspace. [1] A low-floor tram allows accessible level access from curb level platforms.